How To Remove Rust From Stone Wall. Rust on stone and flagstone can come from one of two sources: Rust stains on cement are a common problem for homeowners, especially those who use well water, as it is use trisodium phosphate (tsp) to remove persistent rust from cement.
Removing rust from stone can be extremely difficult but with the correct products it is easy.
Some areas will clean a lot faster than others, which may need multiple. You can make a paste by mixing baking soda and water. Also, learn which commercial cleaners can do the job when the stains are difficult to remove. Follow instructions on the bottle such as using rubber gloves and avoid breathing the fumes.